Electron phonon systems from weak to strong coupling |
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| Authors: | U Göbel A S Alexandrov H Capellmann |
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| Institution: | (1) Institut für Theoretische Physik C, Technische Hochschule Aachen, D-52056 Aachen, Germany;(2) Present address: IRC in Supconductivity, University of Cambridge, CB3 OHE Cambridge, UK |
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| Abstract: | Electron and phonon spectra are derived for an electron-phonon system coupled by the Fröhlich interaction. We cover the range from small coupling  <1 to large coupling  1 for a commensurate filling of the bare band. The evolution of the Migdal solution into a charge density wave and finally into a regular lattice of small polarons is studied. |
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